The sum of Pete's and Sam's ages is 30. Five years ago, Pete was 3 times as old as Sam. How old is Sam?
Let P = Pete's age, S = Sam's age, and P + S = 30. Which of the following equations would complete the system?
P - 5 = 3S
P - 5 = 3S - 5
P - 5 = 3S - 15

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